Those five megapixels and slightly bigger screen are what sets it apart from the other Firefox OS phones on the market. The Fireweb is also the first Firefox OS phone with both LED flash and autofocus, according to Engadget.

Entry-level freedom

But clearly it's still an entry-level device, and Mozilla isn't being shy about that fact.

"Considering its features and price, Firefox OS offers a great value package for customers looking for their first smartphone," reads a press release the company sent out today.

It continues, "The launch of Firefox OS in Brazil is a milestone for the country's mobile industry, increasing the number of design options for intelligent devices [smartphones] and operating systems at affordable prices, based on open standards."

In addition to Brazil, Telefônica Vivo will launch Firefox OS devices in Peru, Uruguay and Mexico "in the coming days," according to this week's announcement.